CN105838331A - Diatomite-based composite phase change heat storage ball, preparation method and application thereof - Google Patents

Abstract

The invention relates to a method for preparing a diatomite-based composite phase change heat storage ball. The method comprises the following steps: mixing diatomite, molten salt, a plasticizer, a thermal conductivity enhancer, a binder and water; aging to form balls, solidifying and drying to obtain a diatomite-based compound phase change heat storage ball, wherein the molten salt exhibits acidity above the melting point. According to the method, diatomite, molten salt, plasticizer, thermal conductivity enhancer and binder are mixed, and then ball-forming and solidifying are carried out to obtain the diatomite-based composite phase change heat storage ball. The heat storage ball has the characteristics of high heat storage density (200-500 DEG C), large thermal conductivity (> 2W / (m.K)), wide usage temperature range (200-1000 DEG C), corrosion resistance, low cost and long service life. The heat storage material prepared by the invention is of a spherical shape, has large specific surface area in accumulation and is convenient for heat exchange; and the spherical heat storage material can roll in a heat transfer channel by utilizing its own characteristics to reach the purpose of transmitting heat energy.

Description

A kind of kieselguhr base composite phase-change heat accumulation ball, preparation method and purposes

Technical field

The invention belongs to new energy materials and energy-conservation field of new, be specifically related to a kind of diatom soil matrix compound phase Become heat accumulation ball, preparation method and purposes, particularly to a kind of kieselguhr base composite phase-change heat accumulation ball and system thereof Preparation Method, described kieselguhr base composite phase-change heat accumulation ball is mainly used in solar energy, wind-power electricity generation heat storage and exchange System, and industrial exhaust heat utilization, move the field such as heat accumulation car or mobile heat accumulation station.

Background technology

Along with the continuous propelling of oneth century of past each developed country process of industrialization, large-scale production constantly expands, Causing natural resources particularly energy resources to consume in a large number, the mankind are the most urgent to the demand of the energy.From previous generation Having recorded since the seventies, traditional energy consumes brought problem of energy crisis and the ring meanwhile produced in a large number Environment pollution problem, makes people gradually start the utilization ratio paying attention to improving the energy, and exploitation has efficiently, joint Energy, reproducible new forms of energy, as improved the utilization ratio of a fossil energy, Devoting Major Efforts To Developing wind energy, the sun The new forms of energy such as energy, geothermal energy.The development and application of heat-storage technology become realize this target important means it One, heat-storage technology can realize the energy storage of instability, the more stable terminal that flows to uses.

Heat accumulating is the key of heat-storage technology, and the heat accumulating of exploitation is of a great variety at present, common are molten Melt salt, organic phase change material, concrete, metal, pottery, sandstone and thermal energy storage material etc..Wherein multiple Conjunction heat accumulating has storage density height, heat conductivity is big, it is little to corrode, length in service life is learned both at home and abroad The concern of person.

The U.S. Randy.P and Terry.e et al. employing is compressing is prepared for NaCO₃-BaCO₃/ MgO is combined Energy storage material module.Germany Gluck and Hahne et al. utilizes the Na of 20～50%₂SO₄It is combined with quartz sand Use and compressing be prepared for heat storage brick, containing mass ratio 20%Na₂SO₄Thermal energy storage material be same volume 2.5 times of storage density of pure quartz-ceramics.Kazushi etc. propose a kind of with copper as phase-change material, One layer of nickel of its electroplating surface is as the high temperature thermal energy storage material of protective layer.Zhang Renyuan, equal at the beginning of nineteen ninety, adopts It is prepared for Na with mixed-sintering method₂CO₃-BaCO₃/ MgO, Na₂SO₄/SiO₂Deng sensible heat/latent heat composite phase-change storage Can material.Wu Jianfeng etc. use SiC to be main material preparation pottery spherical shell, then encapsulate phase transformation in spherical shell Material.

Kieselguhr has high specific surface area, excellent absorbability, feature high temperature resistant, corrosion resistant, is A kind of good silicate inorganic class thermal energy storage material carrier.At present, the compound phase with kieselguhr as carrier Change heat storage material is also paid close attention to by Chinese scholars.But these thermal energy storage materials substantially use organic facies Become material and composite diatomite, use temperature range relatively low.Ding Rui etc. with lauric acid/certain herbaceous plants with big flowers acid (7:3) as phase transformation Material, kieselguhr is that carrier is prepared for composite phase-change heat-storage material.Xi Guoxi etc. with stearic acid as phase-change material, Modification infusorial earth is carrier, and dehydrated alcohol is solvent, uses solution intercalation method to be prepared for stearic acid/modification diatom Soil composite phase-change energy storage material.

This area need a kind of storage density height of exploitation, good heat conductivity, use temperature range wide, corrosion-resistant, Low cost, the phase-change heat-storage material of life-span length.

Summary of the invention

For the deficiencies in the prior art, it is an object of the invention to provide a kind of kieselguhr base composite phase-change heat accumulation Ball, preparation method and purposes.

For reaching this goal of the invention, the present invention by the following technical solutions:

An object of the present invention is to provide the preparation method of a kind of kieselguhr base composite phase-change heat accumulation ball, described Method comprises the steps:

Kieselguhr, fuse salt, plasticizer, heat conductivity reinforcing agent, bonding agent and water are mixed, through old After balling-up, solidification is dried to obtain kieselguhr base composite phase-change heat accumulation ball；

Described fuse salt is in fusing point acidity presented above.

Fuse salt of the present invention in acidity, claims high-temperature acidic fuse salt more than its fusing point.

The present invention makes full use of diatomaceous advantage and is combined with fuse salt, and in preparation, high temperature is combined heat accumulation ball, and Add enhanced thermal conduction material, improve the heat-conducting system of heat accumulation ball, by the application of diatom soil matrix thermal energy storage material Scope is expanded.

Preferably, described fuse salt is containing NO₃ ^-、Cl^-、SO₄ ^2-Fuse salt.

Preferably, described fuse salt is NaNO₃、KNO₃、NaCl、KCl、Na₂SO₄、K₂SO₄In Any a kind or the salt-mixture of at least 2 kinds.

Exemplarily, described salt-mixture can be NaNO₃And KNO₃Mixing, KCl and Na₂SO₄Mixed Conjunction, K₂SO₄Mixing with KCl, KNO₃And Na₂SO₄Mixing, K₂SO₄And NaNO₃Mixing etc..

Preferably, described fuse salt is pretreated fuse salt.

Preferably, described pretreatment is for carrying out ball milling after drying.

Preferably, described dry temperature is 110～130 DEG C, such as 112 DEG C, 115 DEG C, 119 DEG C, 122 DEG C, 126 DEG C, 128 DEG C etc., preferably 120 DEG C；Described baking temperature is 2～4h, such as 2.2h, 2.4h, 2.5h, 2.8h, 3.1h, 3.4h, 3.7h etc..

Preferably, the mesh number after described ball milling is more than 300 mesh, such as 350 mesh, 400 mesh, 450 mesh etc..

Preferably, described diatomaceous SiO₂Content >=80wt% (I level kieselguhr), preferably >=85wt% (II Level kieselguhr).

Preferably, described diatomaceous SiO₂Content accounts for more than 80wt%, actual density 1.9～2.3g/cm³, Bulk density 0.34～0.65g/cm³, specific surface area 40～65m³/ g, porosity 80-90%, water absorption rate is from health Long-pending 2～4 times.

Preferably, described kieselguhr is the kieselguhr through pretreatment.

Preferably, described pretreatment is for carrying out ball milling after drying.

Preferably, described dry temperature is 110～130 DEG C, such as 112 DEG C, 115 DEG C, 119 DEG C, 122 DEG C, 126 DEG C, 128 DEG C etc., preferably 120 DEG C；Described baking temperature is 2～4h, such as 2.1h, 2.4h, 2.7h, 2.9h, 3.2h, 3.6h, 3.8h etc..

Preferably, the mesh number after described ball milling is more than 300 mesh, such as 350 mesh, 400 mesh, 450 mesh etc..

Preferably, described plasticizer cellulose family plasticizer, preferably carboxymethyl cellulose and/or hydroxypropyl methyl Cellulose.

Preferably, described heat conductivity reinforcing agent is graphite or carborundum.

Alternatively, when maximum operation (service) temperature is below 700 DEG C, the heat accumulating of use is generally stone in this area Ink, when 700～1000 DEG C, typically uses carborundum.

Graphite particle diameter is not specifically limited by the present invention, preferably 120～300 mesh.

Preferably, described bonding agent is waterglass.

The modulus of waterglass is not specifically limited by the present invention, and preferably modulus is between 2.2-2.6, and density is 1.36-1.5g/cm³Waterglass.

Preferably, the mixing raw materials by weight portion of described method includes following component:

Preferably, the mixing raw materials by weight portion of described method includes following component:

Preferably, described old temperature is room temperature, and the time is 24～48h, such as 25h, 27h, 29h, 33h, 35h, 37h, 39h etc..

Preferably, described balling-up is carried out in nodulizer, and the circulation rate of described one-tenth globule is preferably 40～70 Rev/min, such as 43 revs/min, 47 revs/min, 49 revs/min, 53 revs/min, 58 revs/min, 64 revs/min, 68 Rev/min etc..

Preferably, after described balling-up, a diameter of the 10～12mm of the ball prepared.

The diameter 90% of described prepared ball is all distributed in the range of 10～12mm.

Preferably, described solidification temperature is room temperature.

Room temperature of the present invention is the indoor temperature that those skilled in the art it has been generally acknowledged that, exemplary is 20～30 DEG C, preferably 25 DEG C.

Preferably, described hardening time is 20～30h, such as 22h, 24h, 26h, 28h etc..

Preferably, described baking temperature is 120～150 DEG C, such as 122 DEG C, 127 DEG C, 132 DEG C, 136 DEG C, 142 DEG C, 146 DEG C etc., described drying time is 4～6h, such as 4.3h, 4.8h, 5.2h, 5.8h etc..

Preferably, the preparation method of kieselguhr base composite phase-change heat accumulation ball of the present invention comprises the steps:

(1) kieselguhr is dried under the conditions of 110～130 DEG C, is milled to more than 300 mesh；

(2) fuse salt is dried under the conditions of 110～130 DEG C, is milled to more than 300 mesh；

(3) by step (1) process after kieselguhr, step (2) process after fuse salt, plasticizer, Heat conductivity reinforcing agent, bonding agent and water mixing, with formed by balling machine behind old 24～48h, become bulb diameter It is 10～12mm, solidifies after placing 20～30h, at 120～150 DEG C, be dried 4～6h obtain diatom soil matrix again Close phase-change thermal storage ball.

It is multiple that the two of the purpose of the present invention are to provide the diatom soil matrix that the described method of one of a kind of purpose prepares Close phase-change thermal storage ball, it is characterised in that described composite phase-change heat-storage ball storage density is 200～500kJ/kg, Thermal conductivity ＞ 2W/ (m K), using temperature range is 200～1000 DEG C.

The three of the purpose of the present invention are to provide a kind of kieselguhr base composite phase-change heat accumulation ball as described in the two of purpose Purposes, it is characterised in that described kieselguhr base composite phase-change heat accumulation ball for solar energy, wind-power electricity generation storage Hot heat-exchange system, industrial exhaust heat utilize, move heat accumulation car or mobile heat accumulation station.

Compared with prior art, the method have the advantages that

After the present invention is by mixing kieselguhr, fuse salt with plasticizer, heat conductivity reinforcing agent, bonding agent, Obtaining based on kieselguhr base composite phase-change heat accumulation ball through balling-up, solidification, described heat accumulation ball has high heat storage close Degree (200～500kJ/kg), thermal conductivity (＞ 2W/ (m K)), use temperature range wide (200～1000 DEG C), Corrosion-resistant, the feature of low cost, the feature of length in service life；

It addition, heat accumulating prepared by the present invention is spherical, when it is piled up, there is bigger specific surface, just In heat exchange, meanwhile, spherical heat accumulating can utilize the feature of self, rolls in heat transfer path, Arrive the purpose transmitting heat energy.

Detailed description of the invention

Technical scheme is further illustrated below by detailed description of the invention.

Those skilled in the art, it will be clearly understood that the only help of described embodiment understands the present invention, are not construed as Concrete restriction to the present invention.

Embodiment 1

(1) pretreatment kieselguhr:

Choose I level kieselguhr through 120 DEG C of dry 3h, be milled to 350 mesh；

(2) pretreatment fuse salt

Choose Na₂SO₄As phase-change material, through 120 DEG C of dry 6h, then it is milled to 350 mesh；

(3) by pretreated molten to 30 parts of pretreated kieselguhr of step (1), 70 parts of steps (2) Melt salt (Na₂SO₄), 3 parts of carboxymethyl celluloses, 10 parts of carborundums, 8 parts of waterglass, 10 parts of water, mixing Uniformly, compound is prepared；

(4) by the old 24h of compound of step (3), then compound is made a diameter of with nodulizer The ball of 10mm, the rotary speed that follows of nodulizer is 50 revs/min；

(5) ball that step (4) prepares is placed 24h, then at a temperature of 150 DEG C, is dried 5h, Obtain kieselguhr base composite phase-change heat accumulation ball.

Performance test:

1. storage density (Δ T=200 DEG C):

The storage density of heat accumulating can be calculated according to below equation:

$Q={\∫}_{T_0}^{T_s}{C}_{ss}dT+\mathrm{\δ}({\∫}_{T_0}^{T_{sf}}{C}_{ls}dT+{\mathrm{\ΔH}}_{lf}+{\∫}_{T_{sf}}^{T_s}{C}_{ll}dT-{\∫}_{T_0}^{T_s}{C}_{ss}dT$

In formula, Q is storage density；C_ss、C_lsAnd C_llRepresent respectively diatomaceous solid phase specific heat capacity, The specific heat capacity of the solid phase of fuse salt and the specific heat capacity of fuse salt liquid phase；δ is the mass percent of fuse salt；ΔH_lf For the latent heat of phase change of fuse salt in melting process；T₀、T_sAnd T_sfBe respectively initial temperature, finishing temperature and Phase transition temperature；Use the phase transformation heat content Δ H of TG-DSC tester test fuse salt_lf, and use sapphire pair Specific heat capacity C is tested than method_ss、C_lsAnd C_ll；

2. heat conductivity:

Use the heat conductivity of the direct test sample of laser heat conducting instrument.

3. temperature range is used:

Use temperature range employing TG-DSC measures the maximum temperature of the decomposition failure of sample, then chooses And safely and effectively temperature the highest higher than fuse salt fusing point one.

In the present embodiment, the invalid temperature of sample is 1050 DEG C, and the fusing point of fuse salt is 884 DEG C, at 1000 DEG C Used below safer, therefore choosing 1000 DEG C is SC service ceiling temperature, uses lower limit temperature not limit Fixed, but it is suitable for high-temperature heat-storage in view of this heat accumulating, therefore lower limit temperature chooses 200 DEG C.

The storage density of the kieselguhr base composite phase-change heat accumulation ball that embodiment 1 prepares is 360kJ/kg, leads Hot coefficient is 2.1W/ (m K), and using temperature range is 200～1000 DEG C.

Embodiment 2

(1) pretreatment kieselguhr:

Choosing I level kieselguhr through 120 DEG C of dry 3h, ball milling is at 300 mesh；

(2) pretreatment fuse salt

Choosing NaCl as phase-change material, through 120 DEG C of dry 6h, then ball milling is at 400 mesh；

(3) by pretreated molten to 40 parts of pretreated kieselguhr of step (1), 60 parts of steps (2) Melt salt (NaCl), the carboxymethyl cellulose of 4 parts, the carborundum of 12 parts, the waterglass of 8 parts, the water of 10 parts, Mix homogeneously, prepares compound；

(4) by old for compound 24h, then with nodulizer, compound is made the ball of a diameter of 10mm, The rotary speed that follows of nodulizer is 60 revs/min

(5) ball that step (4) prepares is placed 24h, then at a temperature of 150 DEG C, is dried 5h, Obtain kieselguhr base composite phase-change heat accumulation ball.

Performance test:

Method of testing is same as in Example 1；

The storage density of the kieselguhr base composite phase-change heat accumulation ball that embodiment 2 prepares is 483kJ/kg, leads Hot coefficient is 2.23W/ (m K), and using temperature range is 200～900 DEG C.

Embodiment 3:

(1) pretreatment kieselguhr:

Choosing II level kieselguhr through 120 DEG C of dry 3h, ball milling is at 400 mesh；

(2) pretreatment fuse salt

Choose NaNO₃As phase-change material, through 120 DEG C of dry 6h, then ball milling is at 400 mesh；

(3) by pretreated molten to 50 parts of pretreated kieselguhr of step (1), 50 parts of steps (2) Melt salt (NaNO₃), the carboxymethyl cellulose of 4 parts, the graphite of 10 parts, the waterglass of 8 parts, the water of 10 parts, Mix homogeneously, prepares compound；

(4) by old for compound 24h, then with nodulizer, compound is made the ball of a diameter of 10mm, The rotary speed that follows of nodulizer is 60 revs/min；

(5) ball that step (4) prepares is placed 24h, then at a temperature of 150 DEG C, is dried 5h, Obtain kieselguhr base composite phase-change heat accumulation ball.

Performance test:

Method of testing is same as in Example 1；

The storage density of the kieselguhr base composite phase-change heat accumulation ball that embodiment 3 prepares is 370kJ/kg, leads Hot coefficient is 2.23W/ (m K), and using temperature range is 20～340 DEG C.

Comparative example 1

Kieselguhr is not contained with differing only in of embodiment 1.

(1) pretreatment fuse salt

Choose NaNO₃As phase-change material, through 120 DEG C of dry 6h, then ball milling is at 400 mesh；

(2) by 60 parts of step (1) pretreated fuse salt (NaNO₃), the carboxymethyl cellulose of 4 parts, The graphite of 12 parts, the waterglass of 8 parts, the water of 10 parts, mix homogeneously, prepare compound；

(3) by old for compound 24h, then with nodulizer by compound ball.

Performance test:

Result: cannot balling-up.Because kieselguhr is as backing material, then cannot balling-up without kieselguhr.

Comparative example 2

It is alkali molten salt with the fuse salt that differs only in of embodiment 1, selects Na₂CO₃As phase-change material.

(1) pretreatment kieselguhr:

Choosing II level kieselguhr through 120 DEG C of dry 3h, ball milling is at 400 mesh；

(2) pretreatment fuse salt

Choose Na₂CO₃As phase-change material, through 120 DEG C of dry 6h, then ball milling is at 400 mesh；

(3) by pretreated molten to 50 parts of pretreated kieselguhr of step (1), 50 parts of steps (2) Melt salt (Na₂CO₃), the carboxymethyl cellulose of 4 parts, the graphite of 10 parts, the waterglass of 8 parts, the water of 10 parts, Mix homogeneously, prepares compound；

(4) by old for compound 24h, then with nodulizer, compound is made the ball of a diameter of 10mm, The rotary speed that follows of nodulizer is 60 revs/min；

(5) ball that step (4) prepares is placed 24h, then at a temperature of 150 DEG C, is dried 5h, Obtain kieselguhr base composite phase-change heat accumulation ball.

Performance test:.

Due to alkali molten salt and kieselguhr generation chemical reaction during high temperature, when heat accumulating is 900 DEG C of uses Time, fuse salt loses the effect as phase-change material, and the phase transformation heat content of the upper test that heat accumulation ball is overall is extremely low, Lose the meaning as heat accumulating.

Comparative example 3

It is added without heat conductivity reinforcing agent with differing only in of embodiment 1.

(1) pretreatment kieselguhr:

Choosing II level kieselguhr through 120 DEG C of dry 3h, ball milling is at 400 mesh；

(2) pretreatment fuse salt

Choose NaNO₃As phase-change material, through 120 DEG C of dry 6h, then ball milling is at 400 mesh；

(3) by pretreated molten to 50 parts of pretreated kieselguhr of step (1), 50 parts of steps (2) Melt salt (NaNO₃), the carboxymethyl cellulose of 4 parts, the waterglass of 8 parts, the water of 10 parts, mix homogeneously, Prepare compound；

(4) by old for compound 24h, then with nodulizer, compound is made the ball of a diameter of 10mm, The rotary speed that follows of nodulizer is 60 revs/min；

(5) ball that step (4) prepares is placed 24h, then at a temperature of 150 DEG C, is dried 5h, Obtain kieselguhr base composite phase-change heat accumulation ball.

Performance test:

Method of testing is same as in Example 1；

The storage density of the kieselguhr base composite phase-change heat accumulation ball that embodiment 3 prepares is 370kJ/kg, leads Hot coefficient is 0.72W/ (m K), and using temperature range is 20～340 DEG C.

Applicant states, the present invention illustrates the process of the present invention by above-described embodiment, but the present invention It is not limited to above-mentioned processing step, does not i.e. mean that the present invention has to rely on above-mentioned processing step and could implement. Person of ordinary skill in the field is it will be clearly understood that any improvement in the present invention, to former selected by the present invention The equivalence of material is replaced and the interpolation of auxiliary element, concrete way choice etc., all falls within the protection model of the present invention Within the scope of enclosing and disclosing.

Claims (10)

1. the preparation method of a kieselguhr base composite phase-change heat accumulation ball, it is characterised in that described method includes Following steps:

Kieselguhr, fuse salt, plasticizer, heat conductivity reinforcing agent, bonding agent and water are mixed, through old After balling-up, solidification is dried to obtain kieselguhr base composite phase-change heat accumulation ball；

Described fuse salt is in fusing point acidity presented above.

2. preparation method as claimed in claim 1, it is characterised in that described fuse salt is containing NO₃ ^-、 Cl^-、SO₄ ^2-Fuse salt；

Preferably, described fuse salt is NaNO₃、KNO₃、NaCl、KCl、Na₂SO₄、K₂SO₄In Any a kind or the salt-mixture of at least 2 kinds；

Preferably, described fuse salt is pretreated fuse salt；

Preferably, described pretreatment is for carrying out ball milling after drying；

Preferably, described dry temperature is 110～130 DEG C, preferably 120 DEG C；Described baking temperature is 2～4h；

Preferably, the mesh number after described ball milling is more than 300 mesh.

3. preparation method as claimed in claim 1 or 2, it is characterised in that described diatomaceous SiO₂ Content >=80wt%, preferably >=85wt%；

Preferably, described diatomaceous SiO₂Content accounts for more than 80wt%, actual density 1.9～2.3g/cm³, Bulk density 0.34～0.65g/cm³, specific surface area 40～65m³/ g, porosity 80-90%, water absorption rate is from health Long-pending 2～4 times；

Preferably, described kieselguhr is the kieselguhr through pretreatment；

Preferably, described pretreatment is for carrying out ball milling after drying；

Preferably, described dry temperature is 110～130 DEG C, preferably 120 DEG C；Described baking temperature is 2～4h；

Preferably, the mesh number after described ball milling is more than 300 mesh.

4. the preparation method as described in one of claims 1 to 3, it is characterised in that described plasticizer is fiber Element class plasticizer, preferably carboxymethyl cellulose and/or hydroxypropyl methyl cellulose；

Preferably, described heat conductivity reinforcing agent is graphite or carborundum；

Preferably, described bonding agent is waterglass.

5. the preparation method as described in one of Claims 1 to 4, it is characterised in that the mixing of described method is former Material includes following component by weight:

Preferably, the mixing raw materials by weight portion of described method includes following component:

6. the preparation method as described in one of Claims 1 to 5, it is characterised in that described old temperature is room Temperature, the time is 24～48h；

Preferably, described balling-up is carried out in nodulizer, and the circulation rate of described one-tenth globule is preferably 40～70 Rev/min；

Preferably, after described balling-up, a diameter of the 10～12mm of the ball prepared.

7. the preparation method as described in one of claim 1～6, it is characterised in that described solidification temperature is room Temperature；

Preferably, described hardening time is 20～30h；

Preferably, described baking temperature is 120～150 DEG C, and described drying time is 4～6h.

8. the preparation method as described in one of claim 1～7, it is characterised in that described method includes as follows Step:

(1) kieselguhr is dried under the conditions of 110～130 DEG C, is milled to more than 300 mesh；

(2) fuse salt is dried under the conditions of 110～130 DEG C, is milled to more than 300 mesh；

(3) by step (1) process after kieselguhr, step (2) process after fuse salt, plasticizer, Heat conductivity reinforcing agent, bonding agent and water mixing, with formed by balling machine behind old 24～48h, become bulb diameter It is 10～12mm, solidifies after placing 20～30h, at 120～150 DEG C, be dried 4～6h obtain diatom soil matrix again Close phase-change thermal storage ball.

9. the kieselguhr base composite phase-change heat accumulation that the method as described in one of claim 1～8 prepares Ball, it is characterised in that described composite phase-change heat-storage ball storage density is 200～500kJ/kg, thermal conductivity ＞ 2W/ (m K), using temperature range is 200～1000 DEG C.

10. a purposes for kieselguhr base composite phase-change heat accumulation ball as claimed in claim 9, its feature exists In, described kieselguhr base composite phase-change heat accumulation ball is used for solar energy, wind-power electricity generation heat storage and exchange system, industry UTILIZATION OF VESIDUAL HEAT IN, mobile heat accumulation car or mobile heat accumulation station.